// Copyright 2014 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

// This file is an internal atomic implementation, use atomicops.h instead.

#ifndef V8_BASE_ATOMICOPS_INTERNALS_ATOMICWORD_COMPAT_H_
#define V8_BASE_ATOMICOPS_INTERNALS_ATOMICWORD_COMPAT_H_

// AtomicWord is a synonym for intptr_t, and Atomic32 is a synonym for int32,
// which in turn means int. On some LP32 platforms, intptr_t is an int, but
// on others, it's a long. When AtomicWord and Atomic32 are based on different
// fundamental types, their pointers are incompatible.
//
// This file defines function overloads to allow both AtomicWord and Atomic32
// data to be used with this interface.
//
// On LP64 platforms, AtomicWord and Atomic64 are both always long,
// so this problem doesn't occur.

#if !defined(V8_HOST_ARCH_64_BIT)

namespace v8 {
namespace base {

    inline AtomicWord Relaxed_CompareAndSwap(volatile AtomicWord* ptr,
        AtomicWord old_value,
        AtomicWord new_value)
    {
        return Relaxed_CompareAndSwap(reinterpret_cast<volatile Atomic32*>(ptr),
            old_value, new_value);
    }

    inline AtomicWord Relaxed_AtomicExchange(volatile AtomicWord* ptr,
        AtomicWord new_value)
    {
        return Relaxed_AtomicExchange(reinterpret_cast<volatile Atomic32*>(ptr),
            new_value);
    }

    inline AtomicWord Relaxed_AtomicIncrement(volatile AtomicWord* ptr,
        AtomicWord increment)
    {
        return Relaxed_AtomicIncrement(reinterpret_cast<volatile Atomic32*>(ptr),
            increment);
    }

    inline AtomicWord Barrier_AtomicIncrement(volatile AtomicWord* ptr,
        AtomicWord increment)
    {
        return Barrier_AtomicIncrement(
            reinterpret_cast<volatile Atomic32*>(ptr), increment);
    }

    inline AtomicWord Acquire_CompareAndSwap(volatile AtomicWord* ptr,
        AtomicWord old_value,
        AtomicWord new_value)
    {
        return v8::base::Acquire_CompareAndSwap(
            reinterpret_cast<volatile Atomic32*>(ptr), old_value, new_value);
    }

    inline AtomicWord Release_CompareAndSwap(volatile AtomicWord* ptr,
        AtomicWord old_value,
        AtomicWord new_value)
    {
        return v8::base::Release_CompareAndSwap(
            reinterpret_cast<volatile Atomic32*>(ptr), old_value, new_value);
    }

    inline void Relaxed_Store(volatile AtomicWord* ptr, AtomicWord value)
    {
        Relaxed_Store(reinterpret_cast<volatile Atomic32*>(ptr), value);
    }

    inline void Release_Store(volatile AtomicWord* ptr, AtomicWord value)
    {
        return v8::base::Release_Store(
            reinterpret_cast<volatile Atomic32*>(ptr), value);
    }

    inline AtomicWord Relaxed_Load(volatile const AtomicWord* ptr)
    {
        return Relaxed_Load(reinterpret_cast<volatile const Atomic32*>(ptr));
    }

    inline AtomicWord Acquire_Load(volatile const AtomicWord* ptr)
    {
        return v8::base::Acquire_Load(
            reinterpret_cast<volatile const Atomic32*>(ptr));
    }

} // namespace base
} // namespace v8

#endif // !defined(V8_HOST_ARCH_64_BIT)

#endif // V8_BASE_ATOMICOPS_INTERNALS_ATOMICWORD_COMPAT_H_
